Valves and valve actuation – Electrically actuated valve
Patent
1997-03-26
1998-12-29
Lee, Kevin
Valves and valve actuation
Electrically actuated valve
251359, F16K 3106
Patent
active
058531610
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention relates to a solenoid valve for controlling pressure mediums. EP-A2-0 331 200 discloses a solenoid valve of this kind in which the valve seat is embodied as a flat seat, which cooperates with a flat sealing face on the end face of the valve member. The valve member is acted upon in the closing direction by a compression spring and is actuated in the opening direction by an armature when the electromagnet is excited. This embodiment has the disadvantage that it is problematic to obtain a high pressure tight pairing of sealing face and valve seat. To this end, the surfaces involved must lie parallel in a highly precise manner. Above all, when high pressure prevails on the valve member end in the chamber adjoining it, and low pressure prevails in the pressure conduit, it is essential that leakages do not additionally result in an application of force on the valve member in the opening direction.
ADVANTAGES OF THE INVENTION
The solenoid valve according to the invention, achieves an embodiment in which a highly precise sealed fit is produced between the valve member and its seat face on the spherical cap at the edge of the outflow of the pressure conduit. Because of the small support area of the valve member on its seat, high surface pressures occur here. In the course of the operation of the solenoid valve, due to the high surface pressure on the seat, it can arise that the seat, which is sharp-edged for the time being, deforms into an annular flattening in the region of the outflow of the pressure conduit. But this is always disposed in a very precise manner, parallel to the sealing face on the end face of the valve member so that a long lasting tightness is assured. This represents a significant improvement over the embodiment according to the prior art, where in the course of the operation of the solenoid valve, in the possible impact of the valve seat into the body that contains it, the material cannot easily flow or deform. There is the danger here that a leakage of the valve will occur in the closed position. As set forth herein, the valve member is moved against the seat by the action of a closing spring in such a way that the valve member can also follow deformations of the valve seat.
The solenoid valve according to the invention can be advantageously used in particular for controlling high pressures such as fuel injection pressures of over 1000 bar.
BRIEF DESCRIPTION OF THE DRAWINGS
The drawing shows a cross-sectional view of essential features of an exemplary embodiment of the invention which is explained in detail in the following description.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
The drawing shows only the part of a solenoid valve that is essential to the invention, in the form of the valve movable member 1, which is moved upward by an electromagnet force .sup.F mag, not shown, and is moved downward by a spring force .sub.f ed, not shown, corresponding to the arrows marked in the drawing. The valve member is guided in a housing 2 and has an end face 3 that is disposed perpendicular to the longitudial axis of the valve member. The sealing face of the valve is realized on this end face. Coaxial to the longitudial axis 4, opposite the end face of the valve member, a pressure conduit 5 emerges from a seat element 6 in a chamber 7. This chamber can be exposed, for example, to a low pressure and can correspondingly communicate with a discharge line. In contrast, a high pressure can prevail in the pressure conduit 5 and is discharged to the chamber 7 when the valve is open.
Toward the chamber 7, the seat element is embodied in the shape of a ball or spherical cap and in particular in the region of the outflow of the pressure conduit 5, has the shape of a spherical cap whose sphere center point 8 is disposed on the axis 4 shared by the valve member 1 and the pressure conduit 5. Consequently, a sharp edge 11 is formed on the spherical surface 10, at the outflow of the pressure conduit, against which edge the sealing face 3 of the valve member comes into sealing contact i
REFERENCES:
patent: 4409638 (1983-10-01), Sturman et al.
patent: 4643393 (1987-02-01), Kosugi et al.
Greigg Edwin E.
Greigg Ronald E.
Lee Kevin
Robert & Bosch GmbH
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